Help cOOLing the room with 3x1000w hps

im thinking about setting up a room with 3 x 1000w hps lights with the hexagon shaped reflectors but i think the room will be too hot. any suggestion how to cool the room down? I was thinking that i could use ac but wouldnt that conflict with the dispersion of co2?

Get some reflectors with a vent in either end, then run ducting from a fresh air intake to each light, (you can do it in series or in parallel, although 3 kw lights in a row might be a bit much) then run it to a big can fan, I'd say 8-10" and out of the room, so the light ventilation is a completely separate system, sealed off from the grow room and so not affecting your co2.